Spark-plug.



s. PIERREL.

SPARK PLUG.

. APPLICATION FILED AUG.10, 1911.

Patented Sept. 3, 1912.

outrun era a a r eerie SPARK-PLUG.

Specification of Illetters Patent.

Application filed August 10, 1911.

Patented Sept. 3,1912.

Serial No. 643,426.

To all whom it may concern Be it known that I, ANTHONY S. PIERREL, acitizen of the United States, residing at Washington, in the parish ofSt. Landry, State of Louisiana, have invented certain new and usefulImprovements. in Spark- Plugs; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to an improvement in spark plugs and has for itsprincipal object to provide a plug which can/be easily cleaned.

Anotherpbject of the invention is to provide a plug of the characterdescribed which is provided with means, for eliminating the spark whenbeing cleaned.

A still further object of the invention is to i provide a spark plug,which is composed of a minimum number of parts, is therefore simple inconstruction, and is cheap to manufacture.

With these and other objects in view, the invent-ion consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawings, and pointed out in the claimshereto appended; it being understood that various changes in the form,proportion, size and minor details of construction within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing: Figure 1 is a side elevation of a spark lug constructedin ac cordance with my invention. Fig. 2 is a longitudinal sectionalview through the same.

Like reference numerals designate correspending parts in all the figuresof the drawing.

Referring to the drawing, 5 designates the metal body of the plug, andthis body is formed with a reduced and exteriorly threaded end 6, theface 7 of said end being inclined. Formed in said body is alongitudinalbore 8 and a counterbore 9. Disposed within the bore and projectingthrough and beyond the bore is an insulating sleeve 10 of porcelain orthe like, said sleeve having a circumferential rib 11 adapted to beseated upon the shoulder L formed by said counterbore. The sleeve isformed with a longitudinal bore 12, and

upper and lower counterbores 13 and 14 respectively. Disposed withinsaid bore 12 1s a contact rod 15, one end 16 projecting beyond thecounterbore 13 and provided with a finger-piece 17 by means of whichsaid rod may be turned. The other end 18 of the rod projects beyond thecounterbore 14 and the inclined face 7 of the body, and is laterallybent as indicated by 19 whereby when in one position it will be in closeproximity to the lower end of the inclined face 7 and in the oppositeposition to be spaced a considerable distance from the upper end of saidface. Thus, when in the former position, a spark can jump from the rodto the body, but when in the latter position, the air space will preventany such spark and consequently there will be no explosion in thecylinder of the engine to which the plug is attached. In order toprevent oil from working into the bore 12 of the sleeve, there isprovided a packing 20 in the counterbore 1 1, and a ring 21 is employedto retain said packing in place, said ring being integral wi h the rod.

A collar 22 is positioned upon the rod 15 below the finger-piece 17 anddisposed around the rod and having one end bearing against said collarand the other end seated within the counterbore 13 of the sleeve, is acoil spring 23 which yieldingly holds the rod in its normal'position.

A nut 21 is disposed around the sleeve above the rib 11, and hasthreaded engagement with the counterbore '9 of the body for retainingsaid sleeve against longitudinal movement.

In practice, when it is desired to clean the plug, the rod 15 is turneduntil the contact point ,is below the upper end of the inclined face 7of the body. The rod can then be reciprocated, and the ring 21 carriedthereby will remove any oil or other matter from the oounterbore 1 1,without causing any spark and consequently without danger ofaccidentally starting the engine.

What is claimed is:

1. In a spark plug, a body having one end formed with an inclined face,an insulating sleeve disposed within the body, and a longitudinallydisposed rod rotatably mounted in said sleeve for rotary movement andhaving one end laterally bent and disposed beyond said inclined face toform in one position a spark gap between the rod and the inclined faceof the body and in another position to yond the body and adapted forboth longitudinal and rotary movements, a ring secured to said rod anddisposed within the counterbore, a packing disposed around the rod abovethe ring, the end of the rod contiguous to the inclined face being bentlaterally, a finger-piece mounted on the other end of the rod forrotating the same, and a coil spring disposed around the rod between thebody and the finger-piece for yieldingly 20 holding said rod in itsnormal position, said lateral end of the rod being adapted to form inone position a spark gap between the-rod and the inclined face of thebody and in another position to space the lateral 25 end of the rod fromthe inclined face of the body a sufilcient distance to prevent a sparkgap being formed.

In testimony whereof, I afiix my signature, in presence of twowitnesses.

ANTHONY S. PIERREL. Witnesses:

A. B. ANDERSON, ALBERT D. FISHER.

